function dataURLtoBlob(dataurl) {
  var arr = dataurl.split(","),
    mime = arr[0].match(/:(.*?);/)[1],
    bstr = atob(arr[1]),
    n = bstr.length,
    u8arr = new Uint8Array(n);
  while (n--) {
    u8arr[n] = bstr.charCodeAt(n);
  }
  return new Blob([u8arr], { type: mime });
}

function blobToDataURL(blob, callback) {
  let a = new FileReader();
  a.onload = function (e) {
    callback(e.target.result);
  };
  a.readAsDataURL(blob);
}

function dataURLtoFile(dataurl, filename = "file1") {
  //将base64转换为文件
  var arr = dataurl.split(","),
    mime = arr[0].match(/:(.*?);/)[1],
    bstr = atob(arr[1]),
    n = bstr.length,
    u8arr = new Uint8Array(n);
  var hz = mime.split("/")[1] ? mime.split("/")[1] : "";
  console.log(hz);
  while (n--) {
    u8arr[n] = bstr.charCodeAt(n);
  }
  return new File([u8arr], filename + "." + hz, { type: mime });
}

export default {
  dataURLtoBlob,
  blobToDataURL,
};
